An insert is formed within a dental model to maintain alignment of seated and removably mounted model teeth of the dental model and to guide each removable model tooth during insertion into and withdrawal from the dental model. The insert includes a plurality of alignment studs captured by each model tooth on seating of same in the dental model and a pin extending from the model tooth into slidable engagement with a passageway in the insert to guide the model tooth during insertion and withdrawa...

A remote controlled model landsailer includes a wheeled vehicle having a sail supported on a mast with a fixed rig position, in which realistic heeling is produced by an outrigger structure including a transversely-mounted resilient wire having wheels at either end thereof, with the elasticity of the wire providing for realistic heeling of the vehicle while at the same time preventing the vehicle capsizing. The model landsailer is remote controlled, in one embodiment, with a single remote contro...

Low molecular weight chymotrypsin analogs exhibiting the binding and catalytic groups of the real enzyme of the formula ##STR1## where D equals .alpha.-, .beta.- or .gamma.-cyclodextrin; P is X or (CH.sub.2).sub.n X, wherein n equals 0 to 2 and X equals S, NH, or 0; Q equals substituted phenyl with the carboxylate ion attached to the ortho position or equals (CH.sub.2).sub.n, wherein n equals 0 to 3; and R equals hydrogen --CH.sub.3 or --C.sub.2 H.sub.5. The enzyme models are useful as an analyt...

A model aircraft, such as a glider, includes a clip for connecting separable wing members thereof to the fuselage. The clip has a resilient bridge portion and spaced depending limbs. The clip fits over an arch section of the fuselage with the limbs having a friction fit in openings in the wings, whereby the wings and fuselage are secured together. The wings may fit in a wing slot in the fuselage with inboard sections of the wings having recesses locating against tabs within the slot. The arch se...

A finger model with joints, being connected to each other and corresponding to a respective finger, having tendon-like cords for their movements is so designed that natural finger movements are possible, whereby the model is of particularly simple and clear design. The finger model can be used as finger endoprosthesis or as a demonstration object for the explanation of finger movements and of injuries of the finger movement mechanism.

A diving model submarine utilizes an automatic depth level control mechanism, water jet propulsion, a water powered aspirator for ballast tank evacuation, hydraulic control of steering, diving plane attitude, and ballast tank valve action. The model diving submarine is controlled by radio signals and fires torpedos.

This invention relates to a new model plastic shuttlecock which composed of a round tail skirt without undulation and a mid-skirt zone with some reinforcing circles and stems of pyramidal section, which offers appropriate strength of its tail skirt. And there are two rows of air resistant surfaces which are extended from the end of the tail skirt towards the mid-skirt zone and the inner side of the feather wings. The air exhaust surfaces have many larger net shaped air stream outlets to make the...

A passive solar heating model for studying the daylight illumination of a lot containing buildings and trees comprises a platform, a pair of arms pivotally mounted at one end thereof to the opposite sides of the platform, and an arcuate guide track pivotally mounted to the free ends of the arms for supporting a light source. The pivotal arms allow adjustments to account for the latitude corresponding to the parallel on which the lot is located and the pivotal guide track allows adjustments to ac...

In a model of a steam locomotive having two independent sets of driving wheels, the single electric motor for driving the model is coupled to the two sets of driving wheels via a differential gear. The latter allows the two sets of driving wheels to alter their angular positions relative to each other, owing to track irregularities and other causes, and thereby enables the model to operate more realistically.

A model figure representing a horse and rider and consisting basically of two pivotally interconnected parts, each of which is an integral unit, formed, for example, of moulded plastic material. In one embodiment of the invention one of the parts is constituted by the arms of the rider and the majority of the horse, apart from the shoulders and fore legs. The hind legs may be formed integrally with this part or they may be pivotally attached to it. The second part of the model in this embodiment...